Need help with couple questions please

Test Preparation SAT Preparation
1

<p>The underlined words are the answer to each question. I would just like to know the explanations to the answers. Thanks</p>

<p>1) Flints found in the region extending form the Nile Valley to the highlands of eastern Iraq attest to the presence of people there as long ago as one hundred thousand years.</p>

<p>2) By virtue of its size and supersensitive electronics, modern radio telescopes are able to gather more waves and discriminate among the with greather precision than earlier versions could.</p>

<p>3) Delgado's dilemma was like many other young writers: he had to choose between assured publication in a student magazine and probable rejection by a popular magazine.</p>

<p>4) The starling is such a pest in rural ares that it has become necessary to find ways of controlling the growth of their population.</p>

<p>Thanks a lot.</p>

2

<ol>
<li>no error </li>
<li>their(telescopes is plural)</li>
<li>like that of many other writers(can't compare people to dilemmas)</li>
<li>its population(starling/pest = singular)</li>
</ol>

3

<p>thanks, but the answer to #1 is ATTESTS TO</p>

4

<p>Then it's a subject-verb disagreement. It should be "Flints...attest to..." not "attests to."</p>